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  1. Core Server
  2. SERVER-15015

Assertion failure when combining $max/$min and reverse index scan

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 2.6.4, 2.7.5
    • Fix Version/s: 2.6.5, 2.7.6
    • Component/s: Querying
    • Labels:
    • Operating System:
      ALL
    • Backport Completed:

      Description

      Issue Status as of Sep 02, 2014

      ISSUE SUMMARY
      Queries combining the $max or $min operators with a reverse index scan on the same field fail producing a stack trace in the log. When run from the shell, an error message is also printed on screen. For example:

      db.foo.ensureIndex({a:-1});
      db.foo.find().max({a: 4}).sort({a: 1})

      produce the following message:

      error: { "$err" : "assertion src/mongo/db/query/query_planner_common.h:110" }

      USER IMPACT
      Queries with these characteristics fail, but they do not affect the server's availability or operation.

      WORKAROUNDS
      N/A

      AFFECTED VERSIONS
      MongoDB 2.6 production releases up to 2.6.4 are affected by this issue.

      FIX VERSION
      The fix is included in the 2.6.5 production release.

      RESOLUTION DETAILS
      Make $min and $max operators aware of index direction so the right index bounds are computed.

      Original description

      This bug causes 2.6.0 - 2.7.4 to non-fatally assert and 2.7.5+ to abort.

      Backtrace from master (c40a73d76c):

      2014-08-25T00:13:23.916-0400 I          [conn1] Invariant failure 0 src/mongo/db/query/query_planner_common.cpp 65
       
      Program received signal SIGTRAP, Trace/breakpoint trap.
      [Switching to Thread 0x7ffff7fcd700 (LWP 10434)]
      0x00007ffff7bcc20b in raise (sig=5) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
      37	../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
       
      (gdb) bt
      #0  0x00007ffff7bcc20b in raise (sig=5) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
      #1  0x00000000017a842a in mongo::mongo_breakpoint () at src/mongo/util/debug_util.cpp:58
      #2  0x000000000179ec2c in mongo::breakpoint () at src/mongo/util/debug_util.h:73
      #3  0x000000000179da9e in mongo::invariantFailed (msg=0x1dd6c74 "0", file=0x1dd6c48 "src/mongo/db/query/query_planner_common.cpp", line=65) at src/mongo/util/assert_util.cpp:142
      #4  0x00000000014a5e87 in mongo::QueryPlannerCommon::reverseScans (node=0x2e86270) at src/mongo/db/query/query_planner_common.cpp:65
      #5  0x0000000001499b7d in mongo::QueryPlannerAnalysis::analyzeSort (query=..., params=..., solnRoot=0x2e86270, blockingSortOut=0x7ffff7fcaf16) at src/mongo/db/query/planner_analysis.cpp:400
      #6  0x000000000149a2cf in mongo::QueryPlannerAnalysis::analyzeDataAccess (query=..., params=..., solnRoot=0x2e86270) at src/mongo/db/query/planner_analysis.cpp:516
      #7  0x00000000014a3506 in mongo::QueryPlanner::plan (query=..., params=..., out=0x7ffff7fcbb70) at src/mongo/db/query/query_planner.cpp:595
      #8  0x000000000145465b in mongo::(anonymous namespace)::prepareExecution (opCtx=0x7ffff7fccb70, collection=0x2e77880, ws=0x2e60850, canonicalQuery=0x3695300, plannerOptions=0, rootOut=0x7ffff7fcbe50, 
          querySolutionOut=0x7ffff7fcbe58) at src/mongo/db/query/get_executor.cpp:315
      #9  0x0000000001455396 in mongo::getExecutor (txn=0x7ffff7fccb70, collection=0x2e77880, rawCanonicalQuery=0x3695300, out=0x7ffff7fcc0e0, plannerOptions=0) at src/mongo/db/query/get_executor.cpp:406
      #10 0x000000000146b734 in mongo::newRunQuery (txn=0x7ffff7fccb70, m=..., q=..., curop=..., result=...) at src/mongo/db/query/new_find.cpp:598
      #11 0x000000000134ecfc in mongo::receivedQuery (txn=0x7ffff7fccb70, c=..., dbresponse=..., m=...) at src/mongo/db/instance.cpp:263
      #12 0x000000000134fdf9 in mongo::assembleResponse (txn=0x7ffff7fccb70, m=..., dbresponse=..., remote=...) at src/mongo/db/instance.cpp:437
      #13 0x000000000108a923 in mongo::MyMessageHandler::process (this=0x2e421a8, m=..., port=0x2e5f180, le=0x2e5fb80) at src/mongo/db/db.cpp:198
      #14 0x00000000017c46e5 in mongo::PortMessageServer::handleIncomingMsg (arg=0x2e52600) at src/mongo/util/net/message_server_port.cpp:227
      #15 0x00007ffff7bc4182 in start_thread (arg=0x7ffff7fcd700) at pthread_create.c:312
      #16 0x00007ffff6cc538d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

      2.6.4 non-fatal assertion:

      Assertion failure 0 src/mongo/db/query/query_planner_common.h 110

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                  Updated:
                  Resolved: